ApplicationNo. 128122 filed on 09/29/1993
US Classes:112/66, Eyelet making83/586, Stored energy furnishes cutting force112/253, Thread end clamps112/298Single blade cutter
ExaminersPrimary: Crowder, Clifford D.
Assistant: Izaguirre, Ismael
Attorney, Agent or Firm
Foreign Patent References
International ClassesD05B 003/08
AbstractThe invention relates to thread trimming devices for eyelet buttonhole machines. The invention comprises a thread trimming device having a snap action spring arm knife. As the thread hook positions the thread and gimp, a cam lifts up the end of the spring arm. The cam then releases the knife whose torque snaps down and cuts the thread and gimp against a second knife edge. The thread and gimp are also held together at this point for the next buttonhole by a thread retainer which is built into the knife.